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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4d0ba89b2e21582699373c10af243cb5b91b12593798af999b7f9b60eb09eb' 
  AND token = 'Oav5ZTGVjfThUiqyCITuLXb8f7GDBbrVM3fYXDykHp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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