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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54aac0eb66a710eb99364227319a99ae590b9bd83f10bfd5ac7817c0ae8ebfac' 
  AND token = 'S66mq6oP7Iict7ujY2+Rw5HWhIY7IkTf8Kfvd9liQIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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