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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3059330d1b792522b1a8303554cfb7d1d34046cc74c4a83f73e1ec1f60f5d4f4' 
  AND token = 'qFnAbQTj05oWK14uvKFMHfetU82kmKeae09fkIpnb4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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