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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ddf410f21d1138551ad06083daa03591539799a550a5f9be659205bbd2a4ef' 
  AND token = 'cNVNrilc0AecBcQcNWqLskw7v/Q7mm2y5YcvJuT6s8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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