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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a872faeeef4352690464dd44ac4de45df0fba0cf1999bd05e0f1a9b4281682' 
  AND token = 'pms4qd7kQG7dWse6Nn+zrQ0RBCzNyT7yc8+xHYTQB9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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