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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bac2699b64c6e7adc21e4b1729aa1b3c346fb448360313f0361dbe1d81ffc9' 
  AND token = 'nts1xcDAc3vQ1dWbN2Z0MedbMuxSQFuqsgtyioT661U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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