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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef27b34b8be9daab9914725b16528d66560e14ebe58e513e0dce13ae39a5ce8' 
  AND token = 'tXhhqSiHha95ex0/60dvi5mmP5TMdMysZ1Duf4Sxj/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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