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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c8b2a2a985019c87a25ee4e31f42d9ca79cd57a3c311fbb6d74767c1d26702' 
  AND token = 'BoCL6OZpiBmur/A6HlB3vmWy6uv9VjlC9TmLWTt1ffA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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