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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853c28545c59d4007328e4d5f4f0ff6a65696ed421c253814d7ea95ea518a165' 
  AND token = '8pnQ3s0HCZMDt8N9+bwhrFXDbojtUoK9waA1J1g093g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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