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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbfdc10c37343e38422134694591c6fa8e7e2f40f36943bd61a1f0d92e76011e' 
  AND token = 'l0ur3O567frQkqWngg2xs7/Fo4LuloaMnK2MXfRMieY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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