SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2060a5bf418e38e4d536f285cc76aa86848f817e4a40bcc00442e9294650be0e' 
  AND token = 'J9E5CVI9pqCu6oRGGQ+GGFsGqdKMyUaxbtQ7dTh1q2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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