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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69dab8524bf8a41a8e1efb235564638320addb2fb2d8e5e85dc4768403d7873a' 
  AND token = '6b9qdSmZuDS0rnoFLQnIb0Jjui0rC0mdlNc05JCx7ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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