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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8648bd819633bde1cc49387b97a946e09341d7acb72a3819c9d7ee09d51d9a64' 
  AND token = 'r7a9ZC7oPp9ntg5F9fWq3HDsIrkFPU2SHQOpbXI/Hps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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