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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c30c7946a89999760b7849348c3af048295360c5773652e1efcfbce7090ee95' 
  AND token = '8qJHGLiYLM7quTdEePQpkaD5wsMLzGXl6Gtol32A1G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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