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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de22d023dc2265d246c31ff6f1a755087cb7cbc198aa6a4b617aea6e110e240' 
  AND token = 'z7JlD7JsSQGxNf2gzgu9PauB4HS21LdCFH4/fIzaGto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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