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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910845ce68ba93358b95cd22f3c0b3c8322288f232b61c29baa017615e0d494c' 
  AND token = 'WMvmqjJASf0VpcHJo96t6XTqcGtb/q3n7g82JqpG7VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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