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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a16a0a34846ea00294de9c37d90f98896619faf0144c0fee444ff06b3c34beef' 
  AND token = 'WjtuhbrIGtPtTT/x8b5HDzleDh+i/ZM9bPe6jkBtYMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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