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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34203b5d48ac3fd2b6168e06606415033e32ec3cd8698cab2154e5139f079b43' 
  AND token = 'xBuGmECrg5WWTt1jmwN6codTRv7O+dayCRe5dBmOW2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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