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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b0963c07ef0b4618b96d8444d4a9d4b6bcd56258844e4afb9655dc5e1d9b51' 
  AND token = 'gB+mDr0cCcVR9DEITZsC4fXL1APP+PzIaxcbUUUqP+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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