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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987965c9d880c7ee7ffa762978ef04c3727296a44f9c3c3f34cc5f98ad8e462d' 
  AND token = 'VZh8PWBugxMd9TTOeIuir8lyYdWC1erOb6ctoaZ1rWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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