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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb369f9d93672ba1b9b7c5a1da1528637501f094a4e52ddb87c4a1d0b249fbc4' 
  AND token = 'M3M9cGUt/I8j1r63KySCvFK/tELIjtBMsYj3S9WIaKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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