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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd65ae251fe89032887ccee652eb4cb9abf32c8ff1a54d12461e8493eaa329d' 
  AND token = '56Yb1sv1lmAwRxvQ5DbQkyDBm8tj13wjUDuyI6OhIWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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