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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34012096b5c23a823401d2c6cd709942206fd005abee22bc337ea7d8139eb4c' 
  AND token = 'xfNaHl0i0m1Oq1TO/0g+9kCjA7RkaN0d8w92ZZHxc4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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