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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a320079e0be2bddf6cfde8ec06f75a6a6a155152eb884fa08d9a938a91396f1' 
  AND token = 'ADoRWjJ38iPGtJMM6xFHADix3cyEfRiIF7HF0C1v76M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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