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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2746e5d47c2d7bfb73e72e048b6ae8332af871ad11d114a1de27e8f79db5f2' 
  AND token = 'Dug4X8eb6F8AITY8fR8HZzig+a8YhctMesOU7jyqMsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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