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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2335b35a16db5eb2879e3da240311673269dfd3fd0890d800aca5a019b9a0cc5' 
  AND token = 'SshZrleSRAmrcafM94ufeBn6R0g+yt0WXwQIKeJc/mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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