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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77dc843ee60e9f43dda20ec6f2cea7565335dc6ce8ff5569e634694e3420f22d' 
  AND token = '5sBztEGiuj89vf5vmzrQ6CDnT/LUX3SwhHqUifLZmJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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