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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dfe91e9697908b1a710cd5b96b1724453f247cdda9619b90f34cc3419c732be' 
  AND token = 'GzSWGKowiD4N4/73GgA+yDkB6a7cbSiXmiiqzL8S1gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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