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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5a873430b7ae7723636f77f415c635a6a6dcbea3532d1d783e06785b582f2b' 
  AND token = 'ft8YN/oSnobitXtAIUaRVSCkP19I6Mn/FXw8Nd6AAEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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