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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bd296588035fa2b106f50c61a5f363d2149b02598a2497796c08133bfbe06e' 
  AND token = '2gAnIuV+cu0vfb0BT1rKTP8bS/yUQKQBBicZBz9TazE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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