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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf9908e05a9c6d54bab278a626bd1feedbf51883d66c7eebddfd96bb4eb414f' 
  AND token = 'fv+GfwZCMf0rrFFU2dXTf7yzG9Vi/jogSGMc2hUz/ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}