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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c030bbae6269ce3d5be9f5430d1a857b880b392a472d0e5657843d742d056f2c' 
  AND token = 'QdCa3RYxFo7xrr3ardyiQYmk0pr6mf8kIzk5ymYL1cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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