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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b5fbeeab18636a7ec576501fe1688a8c283da2ab0356c019e8d211ef760952' 
  AND token = 'zGb8BggCrNnHC+hhdajp50luytMTS12PR4JISLWJfPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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