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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee14d4e6d95cc6f517ca740b3d3f699e0b216b23bb2f718a7b4b93ebb6137041' 
  AND token = 'TQQUvcDLh73OUc/Lxd2PwxNdT3fMvXMc7W9rrIn9u10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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