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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4930c4f600fb1ba2e5c62c309181287b8e92d7a800d945813e029eef144ac4a' 
  AND token = 'Ca5Y8NiOZJnRxZO4Z9XVH3UOfrZNHKu8IiXFpJLBLY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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