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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231cc10109d6040e9ffb759427c407f4cac04a36bffa36cb14e8bb264ecf5528' 
  AND token = 'XPUzxocO6ZIp9J4M6nTg/FokGo7/FtaKiDej/PsPAcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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