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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57f2767c9d5e6d1355424f57c1a6487a0beb4561d1acb78fefc06260fe8a05e' 
  AND token = '3F9LdohmpEJwC9Ooe5GJUZySziumQZBgbNT73MiNOus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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