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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8027b13254cbae063d8342fa2ee63bfcf8eb7cc1263a61a2904c33fd3b42b9b9' 
  AND token = 'TFAHn+48NwQqTAHB31vCAUSryMyz6hrwQ9kM73iQ5mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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