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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b62ec61297006371e21f257c662242cbf5d86d28abafb8d12d6a06c0bcd1a0' 
  AND token = 'CTyHqEZN4QGW742qVqWiSYDvUv1OLoeu5aXhfKfubos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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