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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a98ab377ed6931881c1014140096a9c58509b64ac77061289cca81aa99b539' 
  AND token = 'h7o6JX6SfbTMUdK9pV9JgEVn0HS3Lgu2CJ4wqC0cecs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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