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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f79a295aafbd4c4b4729257eba5ca57e2c45c056a3f4ffdfecfc8fabd911f5b' 
  AND token = 'NS49kMxZ7HvKYeyD5qcy7RJ8RxBnD3U+zRXmhPtcGLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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