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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e18de26cb764b8dcb67aa6ce843a4c6f483d164ca9d6621e52dacc6f0f402c6' 
  AND token = 'bMu4cMDDIizVNw8EImvQaJoRAYX8NrYmHq+zI10K4tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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