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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a658b72c5f2aa64b365bba472c0c1f7510cfa086bff3ab4ea2fd89ce310c5f5e' 
  AND token = 'wfSrBqEgkzYo9/0mze1BF9hly+yHbB37CoWtrn5UWnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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