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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a17eef1dcbef3f06975ce67025099c5a5186ad29a6cb5eb95107bb0f099cfc7' 
  AND token = 'u64agpWferD/r2Pueto/td5xD1eWxyKQJsEwwV04iYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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