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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebb14bccd71f1c886bdd598179d21be1a1bd06dab6cf3d2c3434ceec41ebfe8' 
  AND token = 'NJHtXSXhBJQg8QmHH7nkRefENFbj9a8HlK2l8UicuDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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