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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac26d63d1d9d7c9c1b14e701f9cce96dd624b383617d6e9b9874f805d346d0f' 
  AND token = 'kBafU4urQSbCFqG4mEf054sV+pXs7TR2p49BCMg0hr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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