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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef0e92f3c9542012cf4f8d449fe88915056023c293ceabac4310619af97ec44' 
  AND token = 'tMqotkSbvNrancREVOZL+wkrISfBGJvo9INhoESCKqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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