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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c1f743f330bdc99567b438848d24388271f92e9853917ef0396ffc40b451b6' 
  AND token = 'TZrWlWmJftwgLQN/kSwVfs7o99la/gT7WHkAEGdxl08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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