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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91996378e93caacc970bcdd1e5b721c3e138f7222e748ff3ab5d5f6db88e4796' 
  AND token = 'xZ4oNOiTjxm8upcS6KziZUaXC3eWtCoyo6SLxPC/9q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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