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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3454df02b2ac7bee6dd74745b9933a9697cedb40e8863981c3ac2c5cc464aef7' 
  AND token = 'm6BCax/HYJqKqRHuHHf6S7sJl6POQX7nUHV2c+622sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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