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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c52108bc2472c14e66278729a95a368f27ed79938c2e4b567f56a7ae41f2662' 
  AND token = 'AqhU3JxuM+/lsw8dEchObeAgDWB3NUiaCmaiAz05S30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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