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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b400bc1d53d75a39b65b1aed46e8247ccc8142398b262888a9de0777f31d5a16' 
  AND token = 'wknBKYDb3s5G/QeUL4ZCYdd4rt74Ie6pkdZAgu4X9qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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