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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e1be2d55152e5d952b96fc1fbee5e942ace536ef38a5b4e3e2005cac950fa4' 
  AND token = 'i8AKPu1kRhh9gVGdBYZ+aiDg7c/CreKWCsXKbHwN4YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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