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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c39bdb3b9a207dc4539d4e811f93fa908c39f5128c851a61a4cf01f9ac857e' 
  AND token = '/rz3rC5i7EQ0lVd9XdoSfHqjs9Bf2wZZSHyeyNqEzW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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