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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aee6892ace3c53b30c5dbd9d63eef34028b6cd43ad3ec8a87acb62c18193821' 
  AND token = 'tUK0p11EihRKEvdbGQDKlpdiKUwB3KsG1vJNUWW+p0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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