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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a8aa78e9608049809a9362a177cc26c428771d02a7f7691ed0ff851239310d' 
  AND token = 'vuP5IxJylSo2l+8m7joLIJjRivewzlMx5h4LAArwWFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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