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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb8b2a3cc63b9a5bb3f6ffdf6c4c6719c65cdb7a62a4a3c27f411fbf046196b' 
  AND token = 'fX9DE4MlYYTD45ozWo+QmZjxNN8S0/UXR2iFjKxiQSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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