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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8deee26b3f9c678590d596651637cf69ba8491fcd92d105825468980a2158960' 
  AND token = 'GC16GP7yMPiPhIFSlX7ZH3up7a14hLMTV0FThbWen90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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