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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281165b4b6094d883e5368a5c09d36e5785503998a4ad6b032cdd62fbc200e86' 
  AND token = '8BiMSElaJ8TE8hJN05Wx4EFfw96ahmn6J/iaCwcddbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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