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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321637bf7e8a87a806cc12319bdc1eba026382e98f13febd80311e9f53b837cf' 
  AND token = '0QkFcdEb4+J9ph/kZWw+RUNLjiALwCZ+jVreoyH3jtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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