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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267b67f492ae6e141b56830f0c521c73f2677b05c5d14367f486c53653d5b4b8' 
  AND token = 'V5PSuWEjRr30ChNic0t6P3xD13Udfli7L98rel6Kl2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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