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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f217dba90013eb1d0fa5abb6284fc72fb9b2cf504f809095d6d89e62a29f16' 
  AND token = 'cap/3Ye3ZwNe0YQzemJGODQxkpZdjJuZoGtgnYMHazU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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